Improvement in grates



J.' MILLER.

` Grater No, 48,425. Patented June 2 7, 1865.

` Wmesse N. PETERS Phom-Lnhngmphef. wasmgmn. D4 C.

IINITED STATES PATENT OFFICE.

JAMES MILLER, OF S'I. LOUIS, MISSOURI.`

IMPROVEM ENT IN GRATES.

Specification forming part of Letters Patent No. 48,425, dated June 27, 1865.

To all lwhom it may concern: l

Be it known that I, JAMES MILLER, of St. Louis, in the county ot' St. Louis and State of Missouri, have invented a new and useful Improvement n Grates for W'arming Buildings; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters ot' reference marked thereon.

Figurelis asectional elevation in perspective, showing the grate in the lower story, with the hot-airpipe connecting it with the register'in the second story. Fig. 2 is a sectional elevation, showing the cold air pipe, the two airchambers, which are connected with iron tubes which form the gate-bars, and thehot-air pipe. Fig. 3 is a sectional view, showing the manner of securing the grate-bars to the air chambers..v

To enable those-skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

I form the two side walls of the fire-place ot' two castiron airchambers, A, a section ot' which is shown in Fig. 2. rlhese two air-chainbers are connected together by cylindrical castiron tubes b, which tubes form the back of the {ire-place. i

Leading from one of the air-chambers A is a cold-air pipe, B, the outer end of which should be outside of the building. f

On the opposite side ot' the lgrate from thel cold-air pipe B is a hot-air pipe, G, which connects the chamber A with any desired room in the building. l

The hot-air. pipe may lead to a register, c, in the same room in which the grate is located, in case itis a large room and one tire is insuficient to warm it, or it may conduct to a register, c, in a room in a distant portion of the building, but I prefer to conduct it to a register, o, in tlie hearth of a tre-placeimmediately over that in Which the grate which generates the heat is located.

The register c may be supplied with a radia- 4 tor, c', by adjusting which the heat may be localized or diffused at pleasure.

The cast-iron tubes b, which form the back ot' the grate, will have a square shoulder, n, turned on each end, as shown in Fig. 3. An orifice, m, is made in the side of the chamber A, which is so adjusted as to t tightly up to the shoulder a. The two chambers A are fastened tight up to the shoulders n on the tubes b by means of the screw-bolts x.

The 'grate being put up in any ordinary tireplace, as described above, the cold air will pass through the pipe B into the chambers A and the tubes b, where it will becomeheated without any eXtra consumption of fuel for that purpose, and then it, in its heated state, may be distributed to any place where it is needed.

The pipes B and C may be located entirely within the brick walls of an ordinary chimney,

where they will not disgure any apartment.

The tubesb having the shoulders u tted nicely-up to the chambers A, it will be impossible for any gas to escape from the tire into the room warmed by the heated air. Havingdescribedmyinvention,whatIclaim, and desire to secure by LettersPatent, is

The combination and arrangement ot' the horizontal tubular or hollow gratebars bb with the lateral chambers A A, substantially in the manner and for the purpose herein set forth.

" JAMES -MILLER.

Witnesses: l

GEORGE l?. HERTHEL, J r., M. RANDOLPH. 

